Patent 7571363 was granted and assigned to Agilent Technologies on August, 2009 by the United States Patent and Trademark Office.
A phase comparator is used to test a device under test comprising an input/output (I/O) circuit by applying a signal to the device under test; extracting a phase signal from the phase comparator; and determining parametric information pertaining to the I/O circuit of the device under test from the phase signal.